PHDID YOU KNOW? 
Bulls are known for their charging behavior, but they are actually color-blind to the color red.
Despite the common depiction of bulls being provoked by a red cape, they are actually attracted to the movement of the cape rather than its color. Bulls can only see shades of gray and are more reactive to the movement and shape of objects.
Still don’t believe it? In 2007, the Discovery Channel’s MythBusters tested a live bull on color versus movement in three separate experiments. First, they put three stationary flags, which were red, blue and white, in the bull’s enclosure. The bull charged all three flags regardless of color. Next, they put three dummies dressed in red, blue and white in the ring, and again the bull charged all three without discrimination (and actually charged the red dummy last).
(s)AnimalPlanet